physics-programmer

physics-programmer is an agent for Claude Code from MRCalderon3D/everything-game-dev-code. It costs 19 tokens per session (234 once invoked), scanned A, original, MIT.

A game-development specialist for movement, collisions, and simulated physical behavior, including the details that make controls feel consistent.

In plain words
What is it for?
Use it to build and tune movement systems, collision rules, simulations, and tests for physics-driven gameplay.
Why use it?
It helps avoid unstable physics, inconsistent movement, and edge-case collisions while keeping the game responsive and safe to run.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the everything-game-dev-code plugin — 74 skills, 67 commands, 42 agents, 3 hooks, 6 MCP servers shipped together

Good fit Use it to build and tune movement systems, collision rules, simulations, and tests for physics-driven gameplay.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/mrcalderon3d/everything-game-dev-code/physics-programmer
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/MRCalderon3D/everything-game-dev-code

Made for: Claude Code.

Or install everything-game-dev-code, the plugin that ships this one along with the rest of its 74 skills, 67 commands, 42 agents, 3 hooks, 6 MCP servers.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for physics-programmer

README.md
[![agentmods](https://agentmods.dev/badge/agents/mrcalderon3d/everything-game-dev-code/physics-programmer/github.svg)](https://agentmods.dev/agents/mrcalderon3d/everything-game-dev-code/physics-programmer)
Your own site
<a href="https://agentmods.dev/agents/mrcalderon3d/everything-game-dev-code/physics-programmer"><img src="https://agentmods.dev/badge/agents/mrcalderon3d/everything-game-dev-code/physics-programmer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for physics-programmer

Your own site · 80×15
<a href="https://agentmods.dev/agents/mrcalderon3d/everything-game-dev-code/physics-programmer"><img src="https://agentmods.dev/badge/agents/mrcalderon3d/everything-game-dev-code/physics-programmer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 19 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 234 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00019 $0.00234
Opus 5.5 $0.00008 $0.00094
Sonnet 5.5 $0.00004 $0.00047
Haiku 4.5 $0.00002 $0.00023

Measured 1mo ago against content hash 8191c11c76cb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

physics-programmer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/physics-programmer.md · 41 lines

What it actually says

physics-programmer

Role

Implements movement, collisions, simulation behavior, and game feel through physics.

Responsibilities

  • Create stable, readable movement and collision behavior.
  • Protect feel without sacrificing determinism or runtime safety.
  • Document assumptions around physics, interpolation, and collision edge cases.

Uses These Skills

  • physics-gameplay-patterns
  • performance-budgeting
  • tdd-workflow
  • verification-loop

Collaborates With

  • combat-designer
  • level-designer
  • animation-programmer
  • qa-lead

Deliverables

  • movement systems
  • collision rules
  • simulation tuning
  • debug notes
  • tests

Activation Guidance

  • Use this agent when the task clearly belongs to this specialty.
  • Keep engine-neutral outputs free of single-engine implementation detail unless the task is engine-specific.
  • Escalate conflicts in scope, ownership, feasibility, or release risk instead of hiding them in the output.
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 41 lines · 19 tokens per session scan A 8191c11c76cb

Subscribe to this mod's changes

physics-programmer is an agent published in the GitHub repository MRCalderon3D/everything-game-dev-code (96 stars, last pushed 10d ago), licensed MIT. It adds 19 tokens to every session and 234 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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